Grate



(No Model.)

s. SMITH.

GRATE.

No. 350,952. Patented Oot19, 1886` Wtmasss.

M 777427 72. waw

SIDNEY SMITH, OF CAMBRIDGE, MASSACHUSETTS.

` GRATE.

SPECIFICATION forming part of Letters Patent No. 3503352, dated October 19, 1886.

Application filmi January 1884. Serial No. 8,425, (Ne model.)

To (LZZ whom, it may coiccrn:

Be it known that l', SIDNEY SMITH, of Cambridge, in the County of Middlesex and State of Massachusetts, have invented certain Improvements in Grates, of which the following is a specification.

Thisinvention has forits object, first, to provide a grate having bars of suflicient strength to support the fuel and at the same ti me bring the least possible amount of metal in contact with the fire; secondly, to provide a grate having a large amount of space for air, nade up of the largest practieable number of subdi; Visions, so that the oxygen necessary for the conbustion of the fuel viz., eight pounds of oxygen to one pound of hydrogen, and sixteen pounds of oxygen to six pounds of carbonshall be diffused throughout the entire area of the gratesurface; thircll y, to provide a gratebar adapted to offer the minimum of resistance to the dropping of ashes and waste into the ash-pit; and, finally, to provide adjustable supports for the bearing-bars on which the grate-bars rest, and holding said bearing-bars in position without obstructing the draft or prevent-ing the clearing of ashes and waste.

To these ends my invention consists in the several improvements, which I will now proceed to deseribe and claim.

Of the acconpanying drawings, forning a part of this specification, Figure l represents a perspeetive View of a portion ot' a grate-bar constructed in accordance with n y in vention. Fig. 2 represents a longitudinal section of a furnacc and ash-pit having my in p roved grate and its supporting device. Fig. 3 represents a section on line x x, Fig. 2. Fig. 4 represents an enlarged transversc section of one of the bars.

The same letters ot' reference indicate the same parts in all the figures.

Each of the bars a of my improved grate is composed of two longitndinal parallel drop bars, 2 2, joined at intervals by lateral bars 4, ot' about half the depth of the longtudinal bars, and lateral wings 3, projecting from the opposite outer faces of the longitudinal bars 2, said lateral wings being gradually reduced in thickness from. their upper to their lower edges, and also reduced in width from their upper to their lower edges, as shown in Fig. 4.

b b represent thebearing-bars whiehsupport the grate-bars a. At the points where thegrate bars rest on the bearing-bars two lateral wings, 55, are eXt-ended as far at theirloweras at their upper edges, and may project one-fourth of an ineh beyond the wings 3. Said Wings 5 are of the same depth as the longitudinal bars. These extended wings 5, by forming extended bearings on the bearing-bars, keep the gratebars froni rocking or turning froni a perpendicular position, and by their projection beyond the other lateral wings of the grate-bars maintain a se )aration of about half an ineh between each bar and the next, thus allowing of free passage of draft, and dropping ol' ashes and waste into the aslrpit. If preferred, however, the wings 5 niay project no farther laterally than the 'wings 3, so that all the wings of each bar will abut against all the wings of the next bar. A notch, e, in one end of each of the gratebars at the point of contact with the bearing-bar supporting that end, prevents bodily endwise displacement of the bar, and thus naintains an open space at both ends of the grate-bars, and still allows of longitudinal expansion, the grate-bars being free to slip endwise on the other bearing-bars. The bearing bars are ot' sufficient length to be built into the walls, and are recessed down on the upper side to receive the number of grate-bars forming the whole grate, the length of said recess being less by an inch or more than the entire width ot' the fire-box. The object of this reccss is to keep the grate away from the walls of the fire-box by bringing the extended lateral wings referred to above in contact with the raised portions or shoulders I/ (1 of the bearing-bar formed by the recess. The four extended lateral wings of each grate bar, resting on the bearing bars, form acontinuous line ot' bearing for the grate across the whole width of the lire-box. The bearing-bars are supported in the center, maintained in an upright position, and pre- Vented from warp'ng and settling by a elasp or fork, c, ot' heavy iron, said clasp being welded to the uppcr extremity of a heavy perpendicular rod, e'. Said rod passes down through a proper rest, h, placed on the floor of the ash-pit. On the upper side of the rest is a heavy nut, 75, turning on a thread cnt in the end of said perpendieular rod, and enabling said rod and clasp to be vcrtically ad- IOO 2. The eombination, with the series of grate' bars having lateral wings 5, of the hearing 715 bars set on the wails of the fire-box, and provided with shoulders near said walls, whereby the series of bars are confined lateraily, and the ou'ter bars of the series are prevented from coming in contact with the walls, as set 20 forth. i

` 3. The combinntion, with the grate-bars and the hearing-bars supporting the same, of the eiasps '0, supporting the central portions of the hearing-bars, and means for vertieally ad jnsting said eiztsps to adapt them to the bear- 25 ing-bars, as set forth.

4. The conbination of a series of grate-bars and two or more bearing-bars engged with the grate-bars, as described, so as to hold said bars lateraily and the outer bars from contact 30 with the wails of the fire-box, one of said hearing bars being also engaged with said grate-bars, as described, so as to prevent bodily longitudinal movement thereof.

In testimony whereof Ihwe signed my name 35 to this speoification, in the presence of two snbscribing witnesses, this 2lst day of January, 1854.

SIDNEY SMITH.

XVitnesses:

FRED. XV. -S ITH, C. F. BROWN. 

